Apple pushed out an update to iBooks Wednesday with a few new features and refinements. The biggest feature appears to be a new theme designed to improve reading in low-light areas. Full details below:

• Nighttime reading theme makes reading books in the dark easier on the eyes.
• Full-screen layout lets you focus on the words without distraction.
• iBooks now features an improved selection of fonts, including Athelas, Charter, Iowan, and Seravek.
• Beautiful new classic covers for public domain books.
• A redesigned annotation palette makes it easier to choose a color for your highlighted text.